UFC 3-280-04
17 DEC 2003
5-1.2.7.1 Fair-Hatch
kL (1- α )2 6 2
h=
vu
()
α
3
g
Yd
5-1.2.7.2 Carmen-Kozeny
f 1- α L v 2
h=
φ α3 d g
1- α
f = 150
+ 1.75
Nr
pvd
Nr = φ
5-1.2.7.3 Rose
1 L v2
1.067
h=
Cd 4
φ
α dg
For Nr less than 1:
24
Cd =
Nr
For Nr = 1104 Cd can be approximated by:
24
3
Cd =
+
+ 0.34
Nr
Nr
where:
density (kg/m3)
p
=
h
=
head loss (m)
ƒ
=
friction factor
α
=
porosity
φ
=
shape factor
L
=
depth (m)
d
=
grain diameter (m)
ų
=
face or approach velocity (m/s)
gravity constant (9.8 m/s2)
g
=
Cd
=
coefficient of drag
5-7
Previous Page
